CHENNAI: Tata Consultancy Services has signed a seven-year engagement with an expected value of around U.S. $90 million with Qantas to provide a range of IT application, transformation and maintenance services. Under the contract, TCS will assume full responsibility for more than 75 per cent of the total scope of Qantas programme. TCS will provide support and maintenance to all of Qantas' key IT applications for airport operations.